Gage for objects of circular cross-section.



G. W. CHRISTIANS. GAGEfoR OBJECTS oF CIRCULAR Gauss-SECTION. APPLICATION FILED JULY 15.1918.

1 ,290,9 1 O Y Patented Jan. 14, 1919.

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UNITED sTATEs PATENT oEEroE.

GEORGE W. CHRISTIANS, OF BROOKLYN, NEW YORK, ASSIGNOR T0 THOMAS E. MURRAY,

` OF NEW YORK, N. Y. 1

GAGE FOR OBJECTS OF CIRCULAR CROSS-SECTION.

Specification of Letters Patent.

Patented J an. 14, 1919.

Application filed July 15, 1918. Serial No. 244,915.

To o?? wwm it may concern.'

Be it known that I, GEORGE W. CHRISTIANS, a citizen of the United States, residing at Brooklyn, in the county of Kings and State 0f New York, have invented a certain new and useful Improvement in Gages for Ubjects of Circular Cross-Section, of which the following is a specification.

The invention is a gage for objects of circular cross section, In my present application, I show my invention as applied to the gaging of an elongated proje tile having convex extremities and provided at one end with guide vvanes secured tosaid end. I may* apply it to an elongated projectile not having such vanes,l

and in that case it serves to determine the accuracy of the projectile cylinder. Vhen the guide vanes are present, the gage serves the further purpose of determining whether the central longitudinal axes of the vanes is in line of prolongation of the central longitudinal axis of the cylindrical projectile.

In the accompanying drawings- Figure l is a side elevation of my gage, showing the cylindrical projectile and at tached vanes supportedon the plane table, and inclosed by the suspended frame-this being the operating position of the device. Fig. 2 is a plan view of the same. Fig. 3 is a section on the line 3, 3 of Fig. l, the edges of the table being broken away. Fig. 4 is an enlarged plan view of one end of the gage frame and projectile therein, showing a portion of said frame and inserted detachable plates in horizontal section.

Similar letters-of reference indicate like parts.

A is a plane table, preferably of metal, upon which the projectile B to be gaged is supported. Toa one end of projectile Bare attached the guide vanes. C, D, disposed at right angles to one another, and having ,their common central longitudinal axis in the line of prolongation of the central longitudinal axis of projectile B. E is the gage frame, here a casting in parallelogram form suspended by cords F from a bar G which in turn is attached to a suspension cord H which passes over the xed pulleys I and carries a counter-weight J. The frame can thus be raised and lowered by the hand of the operator, and it may also,in like mansuch as for projectiles.

also more accurate v `that is, at right angles to ner, be moved transversely across the tale The opening in the frame E is to be of such length as that the extremities of the projectile will be tangent to the inner end faces of said frame, or if, as here shown, the guide vanes C, D are present, tangent to one end of the projectile and the outer or unsecured ends of said guide vanes. The inner side faces of the frame opening may be tangent to opposite sides of the circumferential periphery of the projectile, but I prefer to make the width of the frame opening greater than the length of the diameter of the projectile so that there will be clearances between said side faces and said projectile, into which clearances I place detachable plates K, L secured to a rib Non the frame by screw bolts, which plates have their inner faces tangent to the projectile, as shown in the drawings. The object of plates K, L is to insure a more accurate centering of the projectile in the frame, and

lines of tangency. Between the longitudinal edges of the guide vanes C, D and the frame there may be a narrow clearance M, so that said vanes do not rest upon the table A, but are supported by the projectile, to which, as aforesaid, they are secured.

The operation is as follows:

The frame E is moved downwardly until it incloses the projectile and guide vanes, as shown in Fig. 1, with the plates K, L in contact with the circumferential periphery of said projectile. The frame E is then, by the hands of the operator, moved laterally the longitudinal central axis of the projectile-#thus causing the projectile to rotate or roll upon the table. If the guide vanes are not present and the projectile completes an entire rotation without binding in the frame, it is so shown to be truly cylindrical. If the guide vanes are present and the projectile completes an entire rotation without binding in the frame, it is so shown, rst, that the projectile is truly cylindrical, and, second, that the cornmon central longitudinal axis of the guide vanes is in line of lprolongation of the central longitudinal axis of the projectile, with a permitted error depending on the amount of the clearance at M. For if said vanes were not in said line their common central longitudinalaxis would stand at anvangle to the central axis of the projectile, andY if that angle were beyond that permitted by the clearance aforesaid, then the Whole structure (projectile and vanes) would bind in the frame.

The type of vaned projectile here shown is designed for use in trench mortars for projection over short distances, and hence a slight deviation, as above noted, from exact alinement of the axis of the projectile and that of its vanes does not materially affeet the accuracy of flight. But if, for any reason, it be desired that there should be exact alinement of said axes, the plates K,L may be extended so that they will be tangent to the longitudinal edges of the vanes as Well as to the periphery of the projectile; or if the plates II, L are omitted, the periphery of the projectile and the longitudinal edges of the vanes may be tangent to the inner side faces of the frame itself. The table A is, of course, to be of such area as to permit of the complete rotation of the projectile when the frame is moved, as set forth.

I claim:

l. In combination with an object oi' circular cross section to be gaged, a horizontal plane-table for supporting said object, a rectangular frame inclosing and tangent to opposite sides of the circumferential periphery of said object and means Jior supporting said frame in a horizontal plane passing through the axis of the circular object, said traine being movable transversely over said table to cause rotation of said object Within said frame.

2. The combination of claim l, further including detachable plates Within said trarne and tangent to said opposite sides of the circumferential periphery of said object.

3. In combination with an elongated cylindrical projectile, a horizontal planetable for supporting said projectile, a rectangular suspended traine inclosing and tangent to opposite sides ot' said projectile and means for support-ing said frame in a horizontal plane passing through the axis of the circular object, said frame being movable transversely over said table to cause yrotation or' said object within said 'fra-me.

el. In combination with an elongated cylindrical projectile, and guide vanes attached to one end thereof, a horizontal plane-table ior supporting said projectile, a rectangular trame inclosing said projectile and said guide vanes and tangent to opposite sides of said projectile and means for supporting said frame in a horizontal plane passing through the axis of the circular object, said trame being movable transversely over said table to cause rotation of said object Within said trame.

In testimony whereof I have atiixed my signature in presence of two Witnesses.

GEORGE W. CHRISTIANS. Iitnesses GERTRUDE T. PORTER, MAY T. MGGARRY.

Copies of this patent may be obtained for five cents each, by addressing the Commissionerof Patenti,

` Washington, D. C. 

